LED Measuring Principle Part2: LED Photometry Principle
3. LED Photometry Principle 3.1 Methods of Measuring Light Intensity The light intensity standard lamp, LED and silicon photoelectric diode equipped with V (λ) filter are installed and debugged in the optical benches, especially the filament position, LED shiny parts and acceptance scale location should be strictly debugged. The silicon photoelectric diode should be firstly calibrated by the [...]
A Near-field Goniospectroradiometer for LED Measurements
ABSTRACT Designing micro-optics for light-emitting diodes must take into account the near-field radiance and relative spectral power distributions of the emitting LED die surfaces. We present the design and application of a near-field goniospectroradiometer for this purpose. Keywords: Near-field photometry, goniophotometer, LED measurement, spectroradiometer 1. INTRODUCTION One of the often-touted advantages of high-flux light-emitting diodes (LEDs) [...]
Theories About Light Part2: Photometry and Luminous flux
Photometry Photometry is the light measurement, which is defined as electromagnetic radiation detectable by the human eye (daylight). It is thus restricted to the wavelength range from about 380 to 780 nanometers (1000 nm = 1 μm). Photometry is just like radiometry except that everything is weighted by the spectral response of the eye. Visual [...]
